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发明名称
Improvements in or relating to electric signalling systems
摘要
申请公布号
GB326790(A)
申请公布日期
1930.03.13
申请号
GB19280033247
申请日期
1928.11.13
申请人
THE SIEMENS AND GENERAL ELECTRIC RAILWAY SIGNAL COMPANY LIMITED;JAMES BOOT;WILLIAM CHALLIS
发明人
分类号
B61L25/04;H02J13/00
主分类号
B61L25/04
代理机构
代理人
主权项
地址
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